Disclaimer: Do not use a registry editor to edit the registry directly unless you have no alternative. The registry editors bypass the standard safeguards provided by administrative tools. These safeguards prevent you from entering conflicting settings or settings that are likely to degrade performance or damage your system. Editing the registry directly can have serious, unexpected consequences that can prevent the system from starting and require that you reinstall Windows .
All the Simulator settings are saved in the registry under the key
HKEY_CURRENT_USER\SOFTWARE\SimForArduino x.xx where x.xx is the version number
The Registry settings can be viewed by running the RegEdit program or a similar utility.